RTF malware analysis — malicious · 1f25ab9be1923fc6

MALICIOUS

RTF

227.3 KB First seen: 2022-09-06

MD5: 52e3fc9785082d0da0ebdce496034f7e SHA-1: 4643dd7e0ffe0379ec11b5ade72ecabdb8c6a80e SHA-256: 1f25ab9be1923fc610300392f7409cbe49433fb91336a08901c948729493fb79

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The RTF file contains OLE objects and triggers heuristics related to CVE-2017-8570, indicating it attempts to drop a script. The document body explicitly instructs the user to 'click Enable Editing when opening' to bypass security measures, a common lure for macro-based malware delivery. The embedded artifacts are likely the dropped script or payload.

Heuristics 7

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000095f.bin` `38ce53b1d6e31bda67a29000391b37b58d5014d17711fb111cfcd46e1adc9e9a`	rtf-objdata-decoded	RTF \objdata at offset 0x95F	20351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000af57.bin` `43dc420203828d24ec36adf809a9ada54bc1f182c6dd7bd39e852b7059bf1a1d`	rtf-objdata-decoded	RTF \objdata at offset 0xAF57	2632 bytes
`objdata_02_off0000c4fa.bin` `142dc43284d9abe994719f8fb67bc4c04bfc3f07528a1a66b0bad7e552ee8e78`	rtf-objdata-decoded	RTF \objdata at offset 0xC4FA	12297 bytes

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